Dissent on the sand

Members of the Sierra Club demonstrate on a beach in Cancun against the countries they say are avoiding the issue of climate change. The summit will run through Dec. 10. See full story

Members of the Sierra Club demonstrate on a beach in Cancun against the countries they say are avoiding the issue of climate change. The summit will run through Dec. 10. See full story (Ronaldo Schemidt / AFP/Getty Images)

Members of the Sierra Club demonstrate on a beach in Cancun against the countries they say are avoiding the issue of climate change. The summit will run through Dec. 10. See full storyRonaldo Schemidt / AFP/Getty Images